[PATCH] lib/dma-debug: check for vmalloc buffers used with the DMA-API

[Jan Luebbe]

Signed-off-by: Jan Luebbe <jlu@xxxxxxxxxxxxxx>
---
I'm not sure why we don't check for high memory, is there any problem
with this approach?

 lib/dma-debug.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 66ce414..7d60ff0 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -944,6 +944,9 @@ static void check_for_illegal_area(struct device *dev, void *addr, unsigned long
 	if (overlap(addr, len, _text, _etext) ||
 	    overlap(addr, len, __start_rodata, __end_rodata))
 		err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
+	if (is_vmalloc_or_module_addr(addr) ||
+	    is_vmalloc_or_module_addr(addr+len))
+		err_printk(dev, NULL, "DMA-API: device driver maps memory from vmalloc or module address range [addr=%p] [len=%lu]\n", addr, len);
 }
 
 static void check_sync(struct device *dev,
-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/